My Ex-girlfriend is Back

A change happens in Hajoon's dull life. His ex-girlfriend Seunga, who had ghosted him three years ago, had returned. First he thought it was a hallucination, next someone with similar looks. But once she approaches him first he starts taking it seriously. She had moved to the house next to him. Why did she reappear after three silent years? Hajoon starts to see the truth with complex feelings.